the best sport ever, there are many different forms which include Dirt jumping, which is a bike a with a straight frame that jumps of large mounds of dirt, Cross Country (XC) which is a light full suspension bike which is meant for travelling long distances, and a Downhill bike (DH) which is a very heavy bike with thick tires and big front forks meant to go down mountains and so large drops

A brand of bicycle intended for off-road use on dirt or gravel trails. There is no limit to how much you can spend on them. Some of the best ones are amazingly beautiful works of high-performance technology that are also tougher than nails.

Most mountain bikes, though, are bought for fairly cheap, sometimes under $100, at department stores under brands such as Mongoose, Schwinn, or Magna. These "mountain bikes" are covered with fancy graphics, lots of gears, and suspension, but actually work very poorly:

1) The components are all bottom-of-the line, even if they have good names such as Shimano. They are heavy, poorly machined, and wear out or break quickly. The gears will usually grind and skip no matter how well you adjust them. Rims are often steel, which quickly rusts and bends out of round, is very heavy, and is never seen on decent wheels.

2) They are no fun to ride. Most of them weight at least 31-35 pounds, and the full-suspension models weigh around 45! Try riding up a hill on one of these. Most people just ride them around the streets, and the knobby tires soak up so much energy you can actually hear it. Full suspension will completely absorb any power you put out. It feels like riding through mud.

Mountain bikes are extremely popular, though, accounting for over 90% of all bikes on the average college campus. They are easier to ride than road bikes, but will prevent you from ever enjoying bike riding. If they are used for off-road use, they simply become a toy like dirt bikes that you can't use for everyday transportation. Overall, I think they are a backwards development in cycling technology.

"Did you see my new mountain bike? It's loaded! It has full suspension, 24 gears, chrome rims..."

"Dude-do yourself a service and buy a road bike like mine. Then see if you can keep up with me on the road."